Form-clamp for concrete columns



S. O. NYSTRUM. FORM CLAMP FOR CONCRETE COLUMNS. APPLICATION FILED AUG-I9, 1920.

1,383,332. Patented July 5, 1921.

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APPLICATION FILED we. 19. 1920.

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FORM CLAMP FOR CONCRETE COLUMNS.

APPLICATION map we. 19, 1920.

1,383,332. Patented July 5, 1921.

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FORM-CLAMP FOR CONCRETE COLUMNS.

Specification of Letters Patent.

Patented July 5, 1921.

Application filed August 19, 1920. Serial No. 404,521.

To all whom it may concern:

Be it known that I, SAMUEL O. NYSTROM, a citizen of the United'States, residing at Harrison, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Form-Clamps for Concrete Columns; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of the invention is to provide a simple, strong and efiicient clamping means for holding the elements of a form such as used in the molding of concrete columns in their proper relative positions against accidental displacement due to interior strain or weight or otherwise, the construction of the clamping means being such as to provide for facility in assembling and disassembling the form, so that the Work of building the column progresses, an economy of both of time and material in the step by step or progressive construction of the form is effected, as compared with the method now commonly employed and which contemplates the tearing down of one portion of the form after the completion of one part of the column and its reassembling, or erection of a new form is necessary, before a further sec tion or length of the column can be molded; and with this object in view the invention consists in a construction and combination of parts of which a preferred embodiment is shown in the drawings, wherein:

Figure 1 is a side view of a mold form having clamp construction embodying the invention.

Fig. 2 is an edge view of the same.

Fig. 3 is a horizontal sectional view of the plane indicated by the line 33 of Fig. 1.

Fig. 4 is a side view from the opposite side to that indicated in Fig. 1.

Fig. 5 is a horizontal section of a portion of the structure showing the adjustment of the parts for a column of reduced connec tions, as for example the upper portion of a column which is usually reduced in cross sectional area as compared with the lower portion thereof.

Figs. 6, 7 and 8 are detail views respectively of one of the wedges, one of the battens and one of the spacing sleeves.

The form walls which are indicated at 10 obviously may be arranged in any preferred relation and may be of any desired dimensions to correspond with the cross sectional area and form of theconcrete column which is to be produced thereby, and these walls are held in proper position during the pourmg and setting of the concrete or other material of which the column is to be con structed by means of clamps consisting essentially of the uprights 11 and 12, the sidebars 13 and the end bars 14, it being understood that the terms side and ,end are merely used for convenience as their dimen sions, particularly as to length, will depend upon the cross sectional area and form of the column which is to be produced or of the form which is to-be held in place by the clamps. The side and end bars 13 and 14 are arranged in pairs in opposite relations, that is to say, respectively, in contact with opposite sides and ends of the form, and are arranged in parallel planes and preferably adjacent planes as indicated in Figs. 1 and 2 and inside of theuprights 11 and 12. The uprights are connected transversely by adjusting rods or bolts 15, which extend through the uprights and alsothrough spacing sleeves 16 which are interposed between the uprights and serve tohold the latter in the desired relative positions. The ends or projecting portions of the end bars 14 bear against the adjacent innert surfaces of the.

uprights, and the side bars at one side' of the column bear against the uprights 11, while interposed between the side bars at the opposite side of the column and the corresponding or adjacent uprights 12 are 'ar ranged wedges 17 of which the beveled surfaces 18 cooperate with beveled surfaces 19 of said upright 12. The wedges may be secured in their adjusted positions by anchor pins or spikes 20.

The exterior sides of the upright 11, opposite to the surfaces against which the end bars 14 bear are preferably beveled as shown at 21, and in cooperative relation therewith are the beveled surfaces 32 of battens 23 which are secured to the projecting end por tions of the adjacent side bars 13 to the end that when the cross or tie rods 15 are tightened the cooperative action of the beveled surfaces 21 and 22 serve to force the uprights inward and thus force the end bars 14 inward at one end while a corresponding inward tendency is applied to the opposite ends of said end bars by the driving of the wedges 17 At the same time the operation of the wedges 17 serves through the tie rods 15 to"exert an inward pressure or tendency upon the opposite side bars 13. Thus a Compressive or contracting effect is produced by the means provided, to resist any expansive tendency of the form 10 incident to the introduction of "the concrete or other material thereinto. Obviously when one portion of a column has been molded the form may. be removed by disengaging the elements ofthe clamps which may then be employed in another location or in the construction of a succeedingportion of the same column.

It will be noted that washers 24 .are arranged under the nuts with which the extremities of the tie rods or bolts are fitted. y

In order to provide for a contraction of the mold-and clamp asfthe column progresses upward, it being common to reduce the cross sectional area of the colunin after it reaches a certain height, the spacing sleeves 16 are provided with supplemental sections 16 which, when the size of the col umn is to be reduced, can be arranged on the outside of the uprights instead of inside thereof as shown in Fig. 5. The apparatus can therefore be used continuously in the construction of a column from the bottom to the top without necessitating any alteration in the construction and merely by a rearrangement of-the elements of the spacing sleeves. j

-Having thus described the inventlon, what I claim is:- j

'1. A clamp for concrete forms having intersecting side and end bars arranged respectively in pairs and in parallel :planes,

uprights arranged in the exterior angles formed by the extremities of said bars, tie bolts transversely connecting the uprights and spacing sleeves fitted upon said tie rods and in terminal engagement with the facing surfaces of the uprights.

2. A clamp for concrete forms having intersecting side and end bars arranged in pairs and in parallel planes, uprights arranged in'the exterior angles formed by the projecting extremities of said bars and transversely connected by tie rods and interposed spacing sleeves, and wedges interposed between one of said side bars and the adjacent upright. V

3. A form clamp for concrete columns having intersecting side and end bars arranged in pairs and in parallel planes, uprights arranged in the exterior angles formed by the extremities of said bars, tie

bolts transversely connecting said uprights, spacing sleeves fitted upon said tie bolts in bolts and interposed spacing sleeves, the "end bars being in contact with the adjacent surfaces of said uprights, battens carried by the terminal portions of one of the side bars and having beveled inner edges for engagement by beveled exterior'surfaces-of.

the adjacent uprights, and wedges inter- 1 8O posed betweenthe opposite side bar and the adjacent uprights, the last named uprights having beveled inner surfaces for contact with the adjacent surfaces of said wedges. In t'estimony'whereof I aflix my slgnature in presence of two witnesses;

SAMUEL o. NYSTROM.

lVitnesses VINCENT -J. RIzzoLo, GEORGE J. HAMMILL. 

